Persistent noise

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Possible Answers:

DIN.

Last seen on: LA Times Crossword 3 May 21, Monday

Random information on the term “DIN”:

ISO 216 is an international standard for paper sizes, used across the world except in North America and parts of Latin America. The standard defines the “A”, “B” and “C” series of paper sizes, including A4, the most commonly available paper size worldwide. Two supplementary standards, ISO 217 and ISO 269, define related paper sizes; the ISO 269 “C” series is commonly listed alongside the A and B sizes.

All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series.

The oldest known mention of the advantages of basing a paper size on an aspect ratio of √2 is found in a letter written on 25 October 1786 by the German scientist Georg Christoph Lichtenberg to Johann Beckmann.

DIN on Wikipedia